From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Diagram illustrating tyre contact patch tests under various suspension and tube configurations.
| Identifier | ExFiles\Box 68\1\ scan0113 | |
| Date | 9th October 1925 guessed | |
| TOP LEFT SECTION: MOUNT WITH TUBE ON INSIDE OR OUTSIDE ONLY. Since found to be incorrect TOP RIGHT SECTION (E): FRONT O/S MIDDLE LEFT SECTION (D): FRONT N/S R-R STD TYPE S.S TUBE SOLID. PIVOTS & TRACK AS BEFORE ALL TESTS WITH 34" x 7.30 BALLOON TYRES. MIDDLE RIGHT SECTION (B): FRONT N/S AS IN 'A' BUT WITH NO FRICTION IN-BETWEEN LEVER DAMPED SPRING DRIVE BOTTOM LEFT SECTION (C): FRONT N/S HISPANO TYPE S.S TUBE PIVOT LEAN 3° BACK TRACK 3/4" IN AT FRONT BOTTOM RIGHT SECTION (A): PIVOT LEAN 3° BACK TRACK OF WHEEL 3/4" IN AT FRONT | ||